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UNITED STATES PATENT OFFICE.

LINO. G. HOTCHKISS, OF NEV-HAVEN, CONNECTICUT, AND JNO. A. DAVENPORT ANDJNO. W. QUINCY, OF NEV YORK, N. Y.

MANNER or ATTACHING NncKS, SHANKS, Scanws, aw., To GLASS KNOBS ronLocks, CURTAIN-Pins, sw.

Specification of Letters Patent No. 2,361, dated November 16, 1841.

To all 'Lo/wm t may concern:

Be it known that we, JOHN G. I-Io'roHKiss, of the city of New Haven andState of Connecticut, and JOHN A. DAvnNPOR'r and JOHN lV. QUINOY, of thecity of New York and State of New York, have invented a new and improvedInode of securing metallic necks or shanks or screws to knobs of glassintended for door-knobs, curtainepins, and such also as are used forcabinet-furniture or other purposes; and we do hereby declare that thefollowing is a full and exact description thereof.

In forming the knob of glass, whether by blowing or by pressure, weleave a cavity in the back part of the knob where the neck, shank, orscrew, is to be fastened such cavity being so made that by means offusible metal, or alloy, poured into it, the neck, shank, screw, orother article prepared for the purpose, shall be securely held in place.

In the accompanying drawings we have represented several modificationsof our mode of procedure, serving fully to eX- emplify our invention;but we do not intend to limit ourselves to the particular form andmanner of effecting this object, as shown in these drawings, but to varythis as we may think proper, while the general principle, that ofsecuring the parts together by a fusible metallic alloy, is not departedfrom.

In the accompanying drawing Figure l shows a section through a knob fora lock, having the neck fastened into it. The red lines a, a represent ahollow ball of metal inserted in the body of the knob, at the time ofpressing it b, Z) represents the fusible metal, which is to be pouredinto a case or shell of brass, plated metal, &c., which is to constitutethe exterior of the neck; and this being held in place on the back ofthe glass knob, the fusible metal is to be poured into it, so as to fillit, and to enter through an opening left in the knob for that purpose,into the cavity of the hollow ball a, a, a square socket is representedas left at c, to receive the spindle of the lock.

Fig. 2, shows a section of a knob without a neck attached to it; d, CZ,is a nut of metal having a screw cut into it, and inserted in the bodyof the knob; in the same manner with the hollow ball in the lastexamples, e, c, is a depression in the back of the knob around or withinwhich the shell of the metallic neck is to be placed; and f is anopening leading to the screw nut; on pouring in the alloy it will enterthe cavity o-f the screw, and will be held firmly in place. g, g, showsdepressions, or indentations made in the pressed knob, into which thealloy entering, checks all tendency to its turning around. Indentations,or notches, should be generally formed in the glass for this purpose.

Fig. 3, shows another form of the cavity for receiving the alloy. Thepart colored red, and marked 71., represents a piece of cloth, or othercompressible material, which we sometimes insert before pouring in thefusible alloy, so as to allow for the unequal shrinkage of the glass andmetal in cooling.

Fig. 4:, shows a knob which has been blown so as to leave a cavity, z',within it to receive the fusible alloy. The starred part j, will checkthe metal shank, and prevent its turning; and the red portion 7s,represents a piece of cloth, de., inserted in the cavity.

Fig. 5 represents a knob having its neck of glass, but blown or pressedwith a cavity for inserting a screw shank Z, and for surrounding it withthe fusible alloy.

IVhen the neck, shank, screw, &c., is to be fastened to the glass knob,the latter is to be heated to a suitable temperature, say that ofboiling water, when the alloy may be safely poured in; the whole is thenallowed to cool slowly.

Having thus fully described the nature of our invention, and shown themanner in which the same is to be carried into operation, what we claimas new, and desire to secure by Letters Patent, is-

Securing of shanks, screws, &c., within knobs of glass, by means of afusible metal or alloy, substantially in the manner herein made knownand described.

JOI-IN G. I-IOTCI-IKISS. J. A. DAVENPORT. JOHN W. QUINCY. lVitnesses:

W. H. CHURCHILL, A. B. AMERMAN.

